Relay.



PATENTED OCT. l5, 190'! Nol 863,1.;32.

L. H. THULLEN. RELAY.

APPLIQATIDN FILED APR. ao, 1907.

SMQ/Whoa 535% @61H01 umd UNITED sTATns PATENT onnien,

LOUIS H. THL'LIIIIN, OF ICDGIYOOIIPARK, IFNXSYLVAXIA, ASSIGNOR TO THEUNION. SWITCH d', SIGNAL COMPANY, -OF SWISSVALE, PENNSYLVANIA, ACORPORATION OF PENNSYLVANIA.

RELAY.

No. sesse.

Specification of Letters Patent.

Patented oct. 15, 1907.

To all whom iti/nay concmn:

Beit known that I, LoUIs H. THUtIEN, a citizen of l the United States,residing at Edgewood Park, in the county oi Allegheny and State ofPennsylvania, have rial in the openings f and' out beyond thetopsurface'invented certain new and useful Improvements in Relays, 'of which thefollowing is aspeciiication.

This invention relates to relays and particularly to the insulating topwhich supports the electro magnet, Contact posts, etc., and the objectoi the invention is to I will describe a relay embodying my inventionand then point out the novel features in claims.

f In the accompanying drawings: Figure l' is a vertical i transversesection on the line l-l of Figi 2, and Fig. 2 form or even round.' vIprefer, however, to make-them is a plan view partly in section on theline 2-'2 of Fig. l.

ably be circular, andis provided bet a inits upper edge;`

B is a cylindrical tube o i 'glass or ,other transparent '.material,.thelower end of'which 'lits in the annular 4 rabbet a, and a washer bisinterposed between said lower eind .andt'he base.

vThe top consistsof a metal plate C embedded in and ventirely inclosedbyinsulating material D'. AOr in other words the top consistsioi a plateof insulating material'within which is a. metal core. As shown, themetal plate C is of substantially the same diameter as the cylinder B.,while the inclosing body'of insulating material is of greater diameterand is provided with a depending annularl an'ge d which engagesthe'outer surface o the cylindet' B at its upper end. Preferably awasher c will be linterposed between the upper end -of the cylinder andthe top.

The metal plate C is provided with a series ot'square v openings f andthe insulating material extends through with an annular rab- 'provide areinforced top which will'better withstand strains without impaiiing itsinsulating qualities'. j insulated from each other and from the-metalthe top.

recesses are ior the purpose of receiving the square porl tion l1v ofthe contact posts H andthe cylindrical portion h entends upwardlythrough the insulating mateor break. Furthermore the conta ct posts arecompletely While I have shown the openingsand the recesses q square, itis obvious they may be of other angular l angular, especiallytherecesses as any tendency o th A is a base which may be of metal and willprefer- I posts to turn axially is thereby prevented.v

v It is not necessary to describe the other parts illus- `trated in thedrawing a's they are well known and form 4 no part. oi the presentinvention.

in one surface opposite said openings, said recesses being similar' inoutline to said openings but of smaller dimensions.

3. .in insulating top for relays consisting oi a metal plate havingopenings therein, and insulating material entirely inclosing the metalplate and 4filling said openings, v

l and said top having a peripheral flange also of insulating material.

In testimony whereof I have signed my name to thisy specification in thepresence of two subscribed witnesses.

LOUIS H. THULLEN.

Witnesses:

.Emma R. COE,

DANIEL J. MCCAB'IHY.

